Cytarabine 5′-monophosphate is a metabolite of the nucleoside analog Cytarabine , catalyzed by deoxycytidine kinase. Cytarabine 5′-monophosphate is incorporated into DNA by DNA polymerase α, which reduces the rate of DNA synthesis. At a concentration of 15 mM, Cytarabine 5′-monophosphate inhibits nuclear and mitochondrial DNA replication in Saccharomyces cerevisiae (S. cerevisiae). Additionally, Cytarabine 5′-monophosphate (3.5-75.1 mg/kg) improves survival in leukemia mice (L1210 mice). Cytarabine 5′-monophosphate can be used in cancer research[1].